Icon Assistance, Nordic Track Assistance, JK Fitness Assistance, BH Fitness Assistance. | Identifying motor defects

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Some tips for checking engine (search in our blog for more tips and information on how to test engines)

How to check if the treadmill motor is defective:

1. The motor is short-circuited between chassis and red or black cables, symptoms:

• the motor controller power part gets damaged (this defect on controller may happen also for other causes not related to motor),
• the home differential switch off;
• the board goes into short and the engine always runs at maximum speed (this defect on controller may happen also for other causes not related to motor).

2. The motor loses its magnetism, symptoms:
   • the motor does not have any force / torque: this happens when the engine runs for long periods of overload (overheated);
   • you may also experience unstable performance of the controller, increases or decreases in motor speed, or the motor "has no force". Measure the number of motor revs to determine if it is still good.

Take the example of a standard 180V / 4200RPM motor:

 

the ratio between speed and voltage is proportional

If the number of RPMs measured is out of the variation range (5% variation), the motor is probably to be replaced.

c. Motor brushes are defective: if the brushes are not inserted correctly or their surface is not smooth, they may cause sparks and noises during operation. Defective brushes should be replaced and it is recommended to let the engine run 1-2 hours at maximum speed before using the treadmill, so that the new brushes better adapt to the motor.

1. Short or intermittent wobble, abnormal power consumption: in the case of short windings or interrupted windings, the motor generally reports:
   • abnormal power consumption (greater than 1.5 A with a motor connected to drive belt and belt or greater than 500mA with unloaded motor – i.e. not connected to the belt)
   • or does not respect the number of turns.

This is the most risky case because the engine may start if you push it, but it would soon damage the motor controller.

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